2D Roguelike can't pick food, soda or go to exit (and an extra doubt)

I was following the 2D Roguelike tutorial but, as I took some days to follow the tutorial again, I got a bit lost about where I stoped. So, it got a bit confused and now that I reached the "[Adding UI & Level Transitions][1]" part, I realised that the player is not picking the food, the soda or changing the level map when reaches the exit sign. What could I have forgotten? I copied again all the scripts that are under the videos from "[Writing the Board Manager][2]" until "[Adding UI & Level Transitions][3]". Where can be the error? I'm still completely new to Unity. Also, I'm confused about where is defined that the enemy only appears on level 3. [1]: https://unity3d.com/pt/learn/tutorials/projects/2d-roguelike-tutorial/adding-ui-level-transitions?playlist=17150 [2]: https://unity3d.com/pt/learn/tutorials/projects/2d-roguelike-tutorial/writing-board-manager?playlist=17150 [3]: https://unity3d.com/pt/learn/tutorials/projects/2d-roguelike-tutorial/adding-ui-level-transitions?playlist=17150